The trouble with the eternal firearms argument is that anti-firearms types tend to be theorists (many of whom, in my experience, have never even laid hands on a firearm, to say nothing of firing one), and pro-firearms types to be practitioners.

It's sort of like expecting a random Haskell programmer and a random PHP programmer to see eye-to-eye on anything, or indeed to be able to have a productive conversation with one another. In theory, this can occur. In practice...